Variable-speed mechanism for glass-working machines.



"No- 807,306. PATENTED DEC. 12, 1905.

H. B; MURDOGK.

VARIABLE SPEED MECHANISM FOR GLASS WORKING MACHINES.

APPLICATION FILED 11110.4, 1904. RENEWED MAY 21, 1905.

;4LK-u- W/[rV/g 1211125525 I @muwiur ga git-arm UNITED STATES HORACE B.MUItDOOK, OF DETROIT, MICHIGAN.

VARIABLE-SPEED IVIECHANISIVI FOR GLASS-WORKING MACHINES.

I Specification of Letters Patent.

Patented Dec. 12, 1905.

Application filed August 4, 1904. Renewed May 27,1905. Serial No.262.680.

To all whom, it may concern.-

Be it known that I, HORACE B. MURDOOK, a citizen of the United States,residing at Detroit, in the county of Wayne and State of Michigan, haveinvented certain new and useful Improvements in Variable-Speed Mechanismfor Glass-Working Machines; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention relates to im rovements in variable speed gears especizillyapplicable for use in connection with glass cutting or polishingmachines, and particularly relates to that class of variable-speedmechanism wherein the driven shaft is provided with a friction-wheeladapted to be moved radially along a friction-disk carried by thedrivingshaft.

The object of the invention, in addition to providing means for varyingthe speed of the grinding, olishing, or other rotary tool, is to alsoprovi e novel means for shifting the friction-wheel along the drivenshaft and securely locking same in its adjusted position when soshifted.

Other objects and advantages will appear from the following description,and the novel features of the invention will be more particularlypointed out in the claims.

To more fully understand the invention, reference is had to theaccompanying drawings, forming apart of this application, in which likenumerals and letters designate corresponding parts in the several views,and in which Figure 1 is a plan view of a machine with my inventionapplied thereto; Fig,2, a view in side elevation; Fig. 3, a view infront elevation; Fig. 4, a detail horizontal section through the drivenshaft, friction-wheel, and mechanism for shifting said friction-wheel;and Fig. 5, a transverse section in detail through the driven shaft,showing means for locking the same thereon against independent rotarymotion.

In the preferred embodiment of my invention I provide a framework 1 ofsuitable structure provided with the top plate 2, having an aperture 3therethrough. 4 represents transverse tie-rods, which may be ordinarypiping and which extend beyond the end faces of said framework, formin asupport for tanks 5, located beneath an adapted to catch the water fromthe grinding or cutting tools. 6 represents vertical rods suitablysupported by said framework and top plate, and pivotally mounted at theupper end of said rods are swinging brackets 7, adjustably held in anyposition by the setscrew 7 a and provided with a pivotallymountedsupport 7 for the work, which sup port 7 may be locked by theadjustmentscrew 7 8 is a similar bracket mounted below the bracket 7 onthe uprights 6 and provided with the set-screw 8 a swiveled seat 8*, anda set-screw 8 for obvious purposes.

In Fig. 3 I have shown the work-supporting bracket mounted on one of theuprights 6, while the operator s seat is swung on the other support butit is obvious that the bracket 7 may be duplicated on the other side forswinging the work into position with respect to the rotary tool at theopposite end of the machine. When not in use, the worksupporting bracketand seat may be folded inward out of the way, as illustrated in Fig. 1.

Referring now to the driving mechanism, a designates the driving-shaft,loosely journaled in suitable bearings on the top plate 2 and capable oflimited longitudinal movement. The end of this shaft is provided withthe friction-disk A, operating through the slot 3 and provided with thecentral aperture A", the free end of the shaft being engaged by aset-screw a, fora purpose hereinafter referred to. Any suitablemechanism may be employed for driving the shaft a; but for the purposeof illustration I have simply shown the pulley a thereon driven by thecable a J ournaled in suitable hearings on the top plate 2 is arrangedthe driven shaft or workarbor b, disposed at right angles to thedriving-shaft and provided with the customary rotary tools 9. This shaftis provided with a plurality of angular grooves b disposedlongitudinally thereof, and mounted on said shaft is the friction-wheelB, provided with similar-shaped grooves B in cross-section, adapted toaline with the grooves b", but of a varying depth longitudinally toreceive the longitudinally-beveled diamond-shaped keys 0, secured at oneend to a collar C, provided with the annular slot 0.

The friction-wheel B is preferably pro- 'vided with a projecting hub B,formed integral therewith, having the annular slot B therearound.

D is a rod suitably mounted in the supwheel, and a lever pivota ports (1on the top plate 2 and is disposed substantially parallel with thedriven shaft or arbor b. Slidably mounted on this rod D is a sleeve E,provided with an inwardly-extending yoke or arm e and anoutwardly-extending handle 6. F is a lever having the centrallyenlargedortion F apertured to encircle said sleeve I and pivotally securedthereto, as at f". This lever F at its inner end f operates in theannular groove 0 and at its outer end f forms a handle cooperating withthe extending arm (2 for operating the locking mechanism for thefriction-wheel.

The operation of the mechanism is apparent from the foregoing, but willbe briefly summarized. When it is desired to change the speed of thearbor or driven shaft, the handles 6 and f are forced apart, withdrawingthe keys 0 from engagement with the internal grooves of thefriction-wheel B, when the wheel is shifted by means of the slidingsleeve E, the arm or yoke e engaging within the annular slot B of thefriction-wheel. The desired degree of speed having been determined, thekeys 0 are forced between the friction-wheel and its shaft, securelykeying the same in its adjusted position. If it is desired to stop themotion of the tool-arbor, the friction-wheel B is shifted to the centerof the friction-disk A and when opposite the aperture A will be out ofcontact therewith. It will be seen that the frictional contact be tweenthe disk A and the wheel B may be adjusted to a nicety by theadjustment-screw a. It is obvious that certain modifications might bemade in the general construction and arrangement of the operating partsof my invention as hereinbefore described, and I donot wish to belimited to the, exact details disclosed.

What I claim is 1. In a variable-speed mechanism, the combination with adriving-shaft and means for rotating same, of a friction-disk carried bysaid shaft, a driven shaft disposed at right angles thereto and providedwith a longitudinal groove, a friction-wheel carried by said drivenshaft and slotted to register with said groove, a key operating in saidgroove and slot, means for shifting said friction-wheel along saiddriven shaft in engagement with the face of said friction-disk, andindependent means for operating said key for securely keying saidfriction-wheel to its shaft when shifted.

2. In a variable-speed mechanism, the combination with a driving-shaftand means for rotating same, of a friction-disk carried by said shaft, adriven shaft disposed at right angles thereto and provided with alongitudinal groove, a friction-wheel carried by said driven shaft andslotted to register with said groove, a key operating in said groove andslot, a sliding arm enga ing said friction- Ily carried by said slidingarm and operatively connected to said key.

3. In a variable -speed mechanism, the combination with a driving-shaftand means for rotating same, of a friction-disk carried by said shaft, adriven shaft disposed at right angles thereto and provided with alongitudinal groove, a friction-wheel carried by said driven shaft andslotted to register with said groove, a key operating in said groove andslot, a hub carried by said friction-wheel provided with an annularslot, a collar secured to said key provided with an annular slot, asliding arm engaging the annular slot of said hub, and a lever pivotallycarried by said sliding arm and engaging at one end the annular slot ofsaid collar.

4. In variable-speed mechanism, the combination with a driving-shaft andmeans for rotating the same, of a friction-disk carried by said shaft, adriven shaft disposed at right angles thereto and provided with aplurality of longitudinaly-disposed V-shaped grooves, a friction wheelcarried by said driven shaft and provided with a plurality of V-sha edslots to register with said grooves, a plura ity of keys having angularfaces 0 erating in said grooves and slots, means for shifting saidfriction-wheel along said driven shaft in engagement with the face ofsaid frictiondisk, and indepandent means for operating said keys.

5. In a variable speed mechanism, the combination with a driving-shaftand means for rotating same, of a centrally-apertured friction-diskcarried by said shaft, a driven shaft disposed at right angles theretoand provided with a longitudinal groove, a friction-wheel carried bysaid driven shaft and slotted to register with said groove, a keyoperating in said groove and slot, means for shifting saidfriction-wheel along said driven shaft in engagement with the face ofsaid friction-disk, and independent means for operating said key forsecurely keying said friction-wheel to its shaft when shifted.

6. In a variable-speed mechanism, the combination with a driving-shaftand means for rotating same, of a friction-disk carried by said shaft, adriven shaft disposed at right angles thereto and provided with alongitudinal groove, a friction-wheel carried by said driven shaft andslotted to register with said groove, a key operating in said groove andslot, means for shifting said friction-wheel alon said driven shaft inengagement with the face of said friction-disk, independent means foroperating said key for securely keying said friction-wheel to its shaftwhen shifted, and means for regulating the degree of contact betweensaid disk and wheel.

7. In a variable-speed mechanism, the combination with a driving-shaftand means for rotating same, of a centrally-apertured friction-diskcarried by said shaft, a driven shaft disposed at right angles theretoand provided with a longitudinal groove, a friction-wheel carried bysaid driven shaft and slotted to register with said groove, a keyoperating in said groove and slot, a sliding arm engaging saidfriction-wheel, and a lever pivotally carried by said sliding arm andoperatively connected to said key.

I 8. In a variable-speed mechanism, the combination with aloosely-journaled driving-shaft and means for rotating same, of afriction-disk carried by said shaft, a driven shaft disposed at rightangles thereto and provided with a longitudinal groove, a friction-wheelcarried by said driven shaft and slotted to register with said groove, akey operating in said groove and slot, a hub carried by saidfriction-Wheel provided with an annular slot, a collar secured to saidkey provided with an annular slot, a sliding arm engaging the annularslot of said hub, a lever pivotally carried by said sliding arm andengaging at one end the annular slot of said collar, and means forregulating the degree of contact between said friction disk and wheel,comprising a set-screw engaging the free end of said loosely-journaleddriving-shaft.

In testimony whereof I affix my signature in presence of two witnesses.

HORACE B. MURDOOK.

. Witnesses:

H. H. HAGER, M. D. LINToN.

